Yeah, You could put two newts, but for Fire Bellied Toads, you might fit 2 in there. I hope that you be able to beep an ample supply of crickets for them! I am going to be housing a months stock at a time. That is 100 crickets for one month. A five gallon he would be more on the tall side, am I corret, so It would be more suited for a type of tree frog, but I think that the space is limited, so there won't bu much that would go in there, in the tree frog catagory that is.